With that said, I was not ready to give up and toss it away. Crumbly can be a good thing if you know how to further adapt and find a way to use it. I made a macaron with mostly Daiso Soft Clay, and waited till the next day to see how it feels like after it is dried. When dried, I was actually very pleased that it came out to be rather rock solid hard but still retain its lightweight properties.
And then I tried a few more "concoctions". Try mixing Daiso, Hearty and Grace. Perfecto!
Do give Daiso Soft Clay a chance...if you experiment it enough, you might find the beauty of it! I did!